A Seminar Presented onApplication and Properties

of Ceramics Matrix Composite

Submitted byNandan Kumar

M.Tech Material EngineeringRoll No: 001511303001

Jadavpur University Kolkata

IntroductionClassification CMC’s Properties of CMC’sAdvantagesDisadvantagesApplications

Overview

Definition: A composite material is multicomponent system with at least a matrix & reinforcement. General Properties:-• High strength-to-weight ratio• Wear resistance • Corrosion resistance• Greater Fatigue life• Low Electrical conductivity• Anisotropic• Lower Cost • Easy Processing

Introduction

On the basis of Reinforcement

Composite

Classification

Particulate Fibre Laminates

On the basis of Matrix

PMC (Polymer Matrix Composite) MMC (Metal Matrix Composite) CMC (Ceramics Matrix Composite)

Material having ceramic as a matrix material in composites called as Ceramic Matrix Composite (CMC).

Properties of CMC Tensile & Compressive Behaviour No sudden failure in CMC as like in Ceramics. Certain amount of Elongation in CMC improves the tensile and compressive property. Fracture Toughness It limits to ceramics, but for CMC’s fracture toughness increases due to reinforcement. Fatigue Resistance Fatigue occurs due to cyclic loading, in case of CMC’s cracks arrested by reinforcement. So higher Fatigue Resistance.

Ceramic Matrix Composite

Thermal Response It can withstand high temperature.

Chemical Inertness Ceramic do not react with chemicals.

Corrosion Resistance

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Excellent wear and corrosion resistance in a wide range of environments and temperature

Higher strength to weight ratio Higher strength retention at elevated temperature Higher chemical stability Non-catastrophic failure High hardness Lightweight

Advantages of CMC’s

Processing routes for CMCs involve high temperatures – can only be employed with high temperature reinforcements.

CMCs are designed to improve toughness of monolithic ceramics, the main disadvantage of which is brittleness.

High processing temperature results in complexity in manufacturing and hence expensive processing.

Difference in the coefficients of thermal expansion between the matrix and the reinforcement lead to thermal stresses on cooling from the processing temperatures.

Disadvantage of CMC’s

1) Cutting Tools:-

Applications

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2) Aerospace

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3) Jet Engine

4) Burner

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5) Turbine Blade

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6) Hot Fluid Channel

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The advanced ceramics developed during the last three decades were initially found to have some favourable properties which prompted intensive work for their use as high temperature structural part in process industries and in heat conversion devices. Although high temperature strength retention, stress rupture, and resistance to corrosion were good, they failed by catastrophic brittle fracture.

Conclusion

Thank You !!!